st: Small dimension panel: Estimation and diagnostics

We are working with a panel of 9 countries and 10 years of observations.
The data are macroeconomic. Since the countries are not a random sample, I
am inclined to use XTREG and XTSCC for its robustness and correction
capabilities. It is not clear whether serial correlation is present after
the driscoll-kraay estimation procedure.
Given the size of the panel and the absence of any obvious instruments, it
did not seem feasible to estimate with a three-stage least squares(FGLS)
alternative. I would appreciate any comments on the above assumptions
and/or observations on alternative procedures.
Steven
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